You can simulate steaming in a microwave. First defrost the salmon. Put it in a glass dish. Put some soy sauce on the bottom of the dish, say half a cm deep. Add some chopped ginger. Cover the dish with plastic wrap. Microwave for 5 minutes or so. Tastes great and healthly too.

You can also replace the soy sauce with lemon juice, and the chopped ginger with fresh herbs. Certainly not the best way to cook fish fillets, but a quick and still tasty and healthy way. This is useful when you're in places with only a microwave, e.g. at some workplace "kitchens"!
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tricasseJan 22 '13 at 3:58

Yeah. Don't use the microwave. Yes, the tool is useful for certain things--defrosting, reheating, or indeed making french fries (per a lovely blog). It is categorically not useful for cooking from raw.
Use a pan, your oven, or a grill.

WARNING: that blog may cause you to be late for work, ignore sleep, and pay no attention to your significant other. You may also wish to cover your keyboard with a tarp to prevent damage from the amount of saliva you will drool.
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danielSep 15 '10 at 17:37

My suggestion would be to cook en papillote, (wrapped in partchment) such as in this recipe. There is no shame using a microwave for serious culinary endeavors as long as you don't ask it to do what it can't do.